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GFK-0467K 2-1
System Operation
This chapter describes certain system operations of the Series 90-30, 90-20, and Micro PLC
systems. These system operations include:
• A summary of PLC sweep sequences (see Section 1).
• Program organization and user references/data (see Section 2).
• Power-up and power-down sequences (see Section 3).
• Clocks and timers (see Section 4).
• System security through password assignment (see Section 5).
• Model 30 I/O modules (see Section 6).
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